حل ورقة عمل Electricity في العلوم باللغة الإنجليزية للصف الرابع - الفصل الثاني

Reefaa School، Electricity الكهرباء

Ms. Arwa Al Messabi

U 2/ L3

Q1: Answer each one correctly:

1-The flow of electricity charges through a conductor: a-Circuit

b-Electric current

2-Which can slow or stop the flow of electricity: a- Copper b- Silver c- Wood

3-Material that easily flows the electricity.

a- Conductor، b- Insulator

4- A-Put the correct number near each material : 1 if its Conductors or 2 if its Insulators:

(.....1.....) Aluminum -، (......1.....) Steel فولاذ-، (....2.....) Plastic

(......2.... ) Wool - (.....1.....) Copper نحاس-

(......1...) Metal معدن

5 - Put the number of the circuit part near its role in circuit:

1-Voltage Source-Battery 2 -Switch

3-Resistor-Lightbulb، 4 -Wire، A-، 2 ( .........)

it can open or close the path in circuit.

B- ( ......1 ....) moves electrical charges particles along.

C- ( .....4....) allows electrical current to pass easily through. D- ( ....3...) convert electrical energy into other forms of energy.

6- Circuit Open means Switch (open/ close) light (work/ Not work).

7-Circuit Close means Switch (open/ close) light (work/ Not work).

8-The path through which electric current flow: a-Circuit

9- An object that resists flow of energy in electrical circuit: a-Circuit b- Wires c-Resistor

10-The energy stored inside batteries are:

a-Electrical b- Chemical c-Light

11- In an electric circuit, a battery can act as a : b-Voltage source c-Insulator d-Resistor

12- A switch in a circuit are ...: b- Keeps the flow of electricity.

a- acts as an insulator. c-Allows or stops the flow of electricity.

13-Which objects use an electric current? Select all that apply

a-Flashlight، b-Windmill، c TV، d-Kite

14-A student made the circuit in the drawing below. Which does the student need to add to the

circuit to make it work? ؟

a- Another bulb، b-Another battery، c- Another wire

15-An electric fence used to contain cattle works by transmitting energy

through a conductor creating an..: a-Light

b- Sound، c-Electric Current

16-Which best describe how energy change in a lamp?

a-From chemical to thermal.

b-From electrical to light

c-From electrical to thermal.

d-From electrical to chemical.

17- A-Put the correct number near each part of circuit? Then put Series or Parallel in each photo of circuit:

A- (...2.......) Wire، B- (...3.......) Resistor، ......S...e..r..i.e..s............ circuit، C-(.....1.....) Voltage sour، ...P...a..r..a...l.l.e..l........... circuit

18- Choose the correct answer fcoer. each point in the table:

Series circuit دارة توالي

Parallel circuit دارة توازي

Conductive Path مسار الطاقة

If lamp removed or breakdown تعطل او إزالة لمبة

Increase Resistor/ Lamp زيادة المقاومات اللمبات

1- One path. 2- More than one.

1- Stop working. 2- Continue work

1- Decrease energy. 2- Energy still the same

19- The circuits in your home and school are: a- Series

b- Parallel

20- Path has little or no resistance that connects two ends of an electrical source:

a- Electric current، B- Short circuit، c- Circuit

21- A fan is plugged into an extension cord. The extension cord is plugged into a wall outlet.

How does the extension cord help the fan work?

a-The extension cord makes the fan more powerful. b-The extension cord makes the fan easier to operate. c-The extension cord transfers electric currents from the outlet to the fan.

22- You are asked to design a product that will change electrical energy to heat energy.

Choose the item you would research while developing your product.

a-Alarm clock، b-Ceiling fan، c-Hair dryer، d-Cell phone

23 -Is an electric circuit that produce magnetic field: A- Electromagnet B-Field

22- How can increase the strength of the electromagnet?

a- Increase the number of loops. b- Add iron core. c- Add more butteries. d- All the above. 24 - A-In ...., motion is used to produce electricity:

a -Generator، b-Electric motor

25 -In ..., electricity is used to produce motion: a -Generator

26-Amy touched a machine called a Van de Graaf generator, all of her hair stood up. When she removed her hand from the generator, her hair fell back to its normal state. What do you think happened?

a-Charged particles are being pulled from the floor. b-Charged particles are being destroyed. c-Charged particles are being moved from one object to another.

27-Energy can change from one form to another. Which can change mechanical energy into electrical energy?

28- Electrical devices convert electricity energy into different forms of energy. Choose the correct number of the energy produced for each device:

1-Thermal، 2-Light، 3- Motion، 4- Sound

1-Lamp change Electrical energy into ( 1 ) , and ( 2 ) energy. 2- A fan change Electrical energy into ( 3 ) energy. 3-Radio change Electrical energy into ( 4 ) energy. 4-Computer change Electrical energy into (......1.. .) , (......2..... ) and (... ...4 ...) Energy. 5- The Toaster change Electrical energy into (......1......) energy.